ABSTRACT
Some requirements to control systems are typically expressed in frequency domain (such as disturbance rejection), while some others are most often formulated in time domain (such as rise time and overshoot). The latter need to be converted into the frequency domain speci‘cations in order to use frequency domain design methods. Formulations of the time domain requirements are commonly very simple, and the equivalent frequency domain formulations are also simple. The requirements can be translated between the domains with simple approximate relations.
